/* D3DES (V5.09) - 
 * 
 * A portable, public domain, version of the Data Encryption Standard. 
 * 
 * Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge. 
 * Thanks to: Dan Hoey for his excellent Initial and Inverse permutation 
 * code;  Jim Gillogly & Phil Karn for the DES key schedule code; Dennis 
 * Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau, 
 * for humouring me on. 
 * 
 * Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge. 
 * (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992. 
 */
#include "d3des.h" 

static void scrunch(unsigned char *, unsigned long *);
static void unscrun(unsigned long *, unsigned char *);
static void desfunc(unsigned long *, unsigned long *);
static void cookey(unsigned long *);

static unsigned long KnL[32] = {0L};
static unsigned long KnR[32] = {0L};
static unsigned long Kn3[32] = {0L};
static unsigned char Df_Key[24] = {
    0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
    0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
    0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67
};

static unsigned short bytebit[8] = {
    0200, 0100, 040, 020, 010, 04, 02, 01
};

static unsigned long bigbyte[24] = {
    0x800000L, 0x400000L, 0x200000L, 0x100000L,
    0x80000L, 0x40000L, 0x20000L, 0x10000L,
    0x8000L, 0x4000L, 0x2000L, 0x1000L,
    0x800L, 0x400L, 0x200L, 0x100L,
    0x80L, 0x40L, 0x20L, 0x10L,
    0x8L, 0x4L, 0x2L, 0x1L};

/* Use the key schedule specified in the Standard (ANSI X3.92-1981). */

static unsigned char pc1[56] = {
    56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
    9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
    62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
    13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
};

static unsigned char totrot[16] = {
    1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
};

static unsigned char pc2[48] = {
    13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
    22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
    40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
    43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
};

void deskey(unsigned char *key, short edf) /* Thanks to James Gillogly & Phil Karn! */
{
    register int i, j, l, m, n;
    unsigned char pc1m[56], pcr[56];
    unsigned long kn[32];

    for (j = 0; j < 56; j++) {
        l = pc1[j];
        m = l & 07;
        pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1 : 0;
    }
    for (i = 0; i < 16; i++) {
        if (edf == DE1) m = (15 - i) << 1;
        else m = i << 1;
        n = m + 1;
        kn[m] = kn[n] = 0L;
        for (j = 0; j < 28; j++) {
            l = j + totrot[i];
            if (l < 28) pcr[j] = pc1m[l];
            else pcr[j] = pc1m[l - 28];
        }
        for (j = 28; j < 56; j++) {
            l = j + totrot[i];
            if (l < 56) pcr[j] = pc1m[l];
            else pcr[j] = pc1m[l - 28];
        }
        for (j = 0; j < 24; j++) {
            if (pcr[pc2[j]]) kn[m] |= bigbyte[j];
            if (pcr[pc2[j + 24]]) kn[n] |= bigbyte[j];
        }
    }
    cookey(kn);
    return;
}

static void cookey(register unsigned long *raw1)
{
    register unsigned long *cook, *raw0;
    unsigned long dough[32];
    register int i;

    cook = dough;
    for (i = 0; i < 16; i++, raw1++) {
        raw0 = raw1++;
        *cook = (*raw0 & 0x00fc0000L) << 6;
        *cook |= (*raw0 & 0x00000fc0L) << 10;
        *cook |= (*raw1 & 0x00fc0000L) >> 10;
        *cook++ |= (*raw1 & 0x00000fc0L) >> 6;
        *cook = (*raw0 & 0x0003f000L) << 12;
        *cook |= (*raw0 & 0x0000003fL) << 16;
        *cook |= (*raw1 & 0x0003f000L) >> 4;
        *cook++ |= (*raw1 & 0x0000003fL);
    }
    usekey(dough);
    return;
}

void cpkey(register unsigned long *into)
{
    register unsigned long *from, *endp;

    from = KnL, endp = &KnL[32];
    while (from < endp) *into++ = *from++;
    return;
}

void usekey(register unsigned long *from)
{
    register unsigned long *to, *endp;

    to = KnL, endp = &KnL[32];
    while (to < endp) *to++ = *from++;
    return;
}

void des(unsigned char *inblock, unsigned char *outblock)
{
    unsigned long work[2];

    scrunch(inblock, work);
    desfunc(work, KnL);
    unscrun(work, outblock);
    return;
}

static void scrunch(register unsigned char *outof,register unsigned long * into)
{
    *into = (*outof++ & 0xffL) << 24;
    *into |= (*outof++ & 0xffL) << 16;
    *into |= (*outof++ & 0xffL) << 8;
    *into++ |= (*outof++ & 0xffL);
    *into = (*outof++ & 0xffL) << 24;
    *into |= (*outof++ & 0xffL) << 16;
    *into |= (*outof++ & 0xffL) << 8;
    *into |= (*outof & 0xffL);
    return;
}

static void unscrun(register unsigned long *outof, register unsigned char *into)
{
    *into++ = (*outof >> 24) & 0xffL;
    *into++ = (*outof >> 16) & 0xffL;
    *into++ = (*outof >> 8) & 0xffL;
    *into++ = *outof++ & 0xffL;
    *into++ = (*outof >> 24) & 0xffL;
    *into++ = (*outof >> 16) & 0xffL;
    *into++ = (*outof >> 8) & 0xffL;
    *into = *outof & 0xffL;
    return;
}

static unsigned long SP1[64] = {
    0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,
    0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,
    0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,
    0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,
    0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,
    0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,
    0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,
    0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,
    0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,
    0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,
    0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,
    0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,
    0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,
    0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,
    0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,
    0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L
};

static unsigned long SP2[64] = {
    0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
    0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
    0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
    0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,
    0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,
    0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,
    0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,
    0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,
    0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,
    0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,
    0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,
    0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,
    0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,
    0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,
    0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,
    0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L
};

static unsigned long SP3[64] = {
    0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,
    0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,
    0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,
    0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,
    0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,
    0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,
    0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,
    0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,
    0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,
    0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,
    0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,
    0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,
    0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,
    0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,
    0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,
    0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L
};

static unsigned long SP4[64] = {
    0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
    0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,
    0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,
    0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,
    0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,
    0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,
    0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,
    0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,
    0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,
    0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,
    0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,
    0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
    0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,
    0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,
    0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,
    0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L
};

static unsigned long SP5[64] = {
    0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,
    0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,
    0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,
    0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,
    0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,
    0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,
    0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,
    0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,
    0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,
    0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,
    0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,
    0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,
    0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,
    0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,
    0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,
    0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L
};

static unsigned long SP6[64] = {
    0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,
    0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,
    0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,
    0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,
    0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,
    0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,
    0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,
    0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,
    0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,
    0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,
    0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,
    0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,
    0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,
    0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,
    0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,
    0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L
};

static unsigned long SP7[64] = {
    0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
    0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
    0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
    0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
    0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
    0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
    0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
    0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
    0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
    0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
    0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
    0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
    0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
    0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
    0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
    0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L
};

static unsigned long SP8[64] = {
    0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
    0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
    0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
    0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
    0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
    0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
    0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
    0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
    0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
    0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
    0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
    0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
    0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
    0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
    0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
    0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L
};

static void desfunc(register unsigned long *block, register unsigned long *keys)
{
    register unsigned long fval, work, right, leftt;
    register int round;

    leftt = block[0];
    right = block[1];
    work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
    right ^= work;
    leftt ^= (work << 4);
    work = ((leftt >> 16) ^ right) & 0x0000ffffL;
    right ^= work;
    leftt ^= (work << 16);
    work = ((right >> 2) ^ leftt) & 0x33333333L;
    leftt ^= work;
    right ^= (work << 2);
    work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
    leftt ^= work;
    right ^= (work << 8);
    right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
    work = (leftt ^ right) & 0xaaaaaaaaL;
    leftt ^= work;
    right ^= work;
    leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;

    for (round = 0; round < 8; round++) {
        work = (right << 28) | (right >> 4);
        work ^= *keys++;
        fval = SP7[ work & 0x3fL];
        fval |= SP5[(work >> 8) & 0x3fL];
        fval |= SP3[(work >> 16) & 0x3fL];
        fval |= SP1[(work >> 24) & 0x3fL];
        work = right ^ *keys++;
        fval |= SP8[ work & 0x3fL];
        fval |= SP6[(work >> 8) & 0x3fL];
        fval |= SP4[(work >> 16) & 0x3fL];
        fval |= SP2[(work >> 24) & 0x3fL];
        leftt ^= fval;
        work = (leftt << 28) | (leftt >> 4);
        work ^= *keys++;
        fval = SP7[ work & 0x3fL];
        fval |= SP5[(work >> 8) & 0x3fL];
        fval |= SP3[(work >> 16) & 0x3fL];
        fval |= SP1[(work >> 24) & 0x3fL];
        work = leftt ^ *keys++;
        fval |= SP8[ work & 0x3fL];
        fval |= SP6[(work >> 8) & 0x3fL];
        fval |= SP4[(work >> 16) & 0x3fL];
        fval |= SP2[(work >> 24) & 0x3fL];
        right ^= fval;
    }

    right = (right << 31) | (right >> 1);
    work = (leftt ^ right) & 0xaaaaaaaaL;
    leftt ^= work;
    right ^= work;
    leftt = (leftt << 31) | (leftt >> 1);
    work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
    right ^= work;
    leftt ^= (work << 8);
    work = ((leftt >> 2) ^ right) & 0x33333333L;
    right ^= work;
    leftt ^= (work << 2);
    work = ((right >> 16) ^ leftt) & 0x0000ffffL;
    leftt ^= work;
    right ^= (work << 16);
    work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
    leftt ^= work;
    right ^= (work << 4);
    *block++ = right;
    *block = leftt;
    return;
}

#ifdef D2_DES 

void des2key(unsigned char *hexkey, short mode) /* stomps on Kn3 too */
{
    short revmod;

    revmod = (mode == EN0) ? DE1 : EN0;
    deskey(&hexkey[8], revmod);
    cpkey(KnR);
    deskey(hexkey, mode);
    cpkey(Kn3); /* Kn3 = KnL */
    return;
}

void Ddes(unsigned char *from, unsigned char *into)
{
    unsigned long work[2];

    scrunch(from, work);
    desfunc(work, KnL);
    desfunc(work, KnR);
    desfunc(work, Kn3);
    unscrun(work, into);
    return;
}

void D2des(unsigned char *from, unsigned char *into)
{
    unsigned long *right, *l1, swap;
    unsigned long leftt[2], bufR[2];

    right = bufR;
    l1 = &leftt[1];
    scrunch(from, leftt);
    scrunch(&from[8], right);
    desfunc(leftt, KnL);
    desfunc(right, KnL);
    swap = *l1;
    *l1 = *right;
    *right = swap;
    desfunc(leftt, KnR);
    desfunc(right, KnR);
    swap = *l1;
    *l1 = *right;
    *right = swap;
    desfunc(leftt, Kn3);
    desfunc(right, Kn3);
    unscrun(leftt, into);
    unscrun(right, &into[8]);
    return;
}

void makekey(register char *aptr, register unsigned char *kptr)
{
    register unsigned char *store;
    register int first, i;
    unsigned long savek[96];

    cpDkey(savek);
    des2key(Df_Key, EN0);
    for (i = 0; i < 8; i++) kptr[i] = Df_Key[i];
    first = 1;
    while ((*aptr != '\0') || first) {
        store = kptr;
        for (i = 0; i < 8 && (*aptr != '\0'); i++) {
            *store++ ^= *aptr & 0x7f;
            *aptr++ = '\0';
        }
        Ddes(kptr, kptr);
        first = 0;
    }
    useDkey(savek);
    return;
}

void make2key(register char *aptr, register unsigned char *kptr)
{
    register unsigned char *store;
    register int first, i;
    unsigned long savek[96];

    cpDkey(savek);
    des2key(Df_Key, EN0);
    for (i = 0; i < 16; i++) kptr[i] = Df_Key[i];
    first = 1;
    while ((*aptr != '\0') || first) {
        store = kptr;
        for (i = 0; i < 16 && (*aptr != '\0'); i++) {
            *store++ ^= *aptr & 0x7f;
            *aptr++ = '\0';
        }
        D2des(kptr, kptr);
        first = 0;
    }
    useDkey(savek);
    return;
}

#ifndef D3_DES	/* D2_DES only */ 
#ifdef	D2_DES	/* iff D2_DES! */ 

void cp2key(register unsigned long *into)
{
    register unsigned long *from, *endp;

    cpkey(into);
    into = &into[32];
    from = KnR, endp = &KnR[32];
    while (from < endp) *into++ = *from++;
    return;
}

void use2key(register unsigned long *from) /* stomps on Kn3 too */
{
    register unsigned long *to, *endp;

    usekey(from);
    from = &from[32];
    to = KnR, endp = &KnR[32];
    while (to < endp) *to++ = *from++;
    cpkey(Kn3); /* Kn3 = KnL */
    return;
}

#endif	/* iff D2_DES */ 
#else	/* D3_DES too */ 

static void D3des(unsigned char *, unsigned char *);

void des3key(unsigned char *hexkey, short mode)
{
    unsigned char *first, *third;
    short revmod;

    if (mode == EN0) {
        revmod = DE1;
        first = hexkey;
        third = &hexkey[16];
    }
    else {
        revmod = EN0;
        first = &hexkey[16];
        third = hexkey;
    }
    deskey(&hexkey[8], revmod);
    cpkey(KnR);
    deskey(third, mode);
    cpkey(Kn3);
    deskey(first, mode);
    return;
}

void cp3key(register unsigned long *into)
{
    register unsigned long *from, *endp;

    cpkey(into);
    into = &into[32];
    from = KnR, endp = &KnR[32];
    while (from < endp) *into++ = *from++;
    from = Kn3, endp = &Kn3[32];
    while (from < endp) *into++ = *from++;
    return;
}

void use3key(register unsigned long *from)
{
    register unsigned long *to, *endp;

    usekey(from);
    from = &from[32];
    to = KnR, endp = &KnR[32];
    while (to < endp) *to++ = *from++;
    to = Kn3, endp = &Kn3[32];
    while (to < endp) *to++ = *from++;
    return;
}

static void D3des(unsigned char *from, unsigned char *into) /* amateur theatrics */
{
    unsigned long swap, leftt[2], middl[2], right[2];

    scrunch(from, leftt);
    scrunch(&from[8], middl);
    scrunch(&from[16], right);
    desfunc(leftt, KnL);
    desfunc(middl, KnL);
    desfunc(right, KnL);
    swap = leftt[1];
    leftt[1] = middl[0];
    middl[0] = swap;
    swap = middl[1];
    middl[1] = right[0];
    right[0] = swap;
    desfunc(leftt, KnR);
    desfunc(middl, KnR);
    desfunc(right, KnR);
    swap = leftt[1];
    leftt[1] = middl[0];
    middl[0] = swap;
    swap = middl[1];
    middl[1] = right[0];
    right[0] = swap;
    desfunc(leftt, Kn3);
    desfunc(middl, Kn3);
    desfunc(right, Kn3);
    unscrun(leftt, into);
    unscrun(middl, &into[8]);
    unscrun(right, &into[16]);
    return;
}

void make3key(register char *aptr, register unsigned char *kptr)
{
    register unsigned char *store;
    register int first, i;
    unsigned long savek[96];

    cp3key(savek);
    des3key(Df_Key, EN0);
    for (i = 0; i < 24; i++) kptr[i] = Df_Key[i];
    first = 1;
    while ((*aptr != '\0') || first) {
        store = kptr;
        for (i = 0; i < 24 && (*aptr != '\0'); i++) {
            *store++ ^= *aptr & 0x7f;
            *aptr++ = '\0';
        }
        D3des(kptr, kptr);
        first = 0;
    }
    use3key(savek);
    return;
}

#endif	/* D3_DES */ 
#endif	/* D2_DES */ 

/* Validation sets: 
 * 
 * Single-length key, single-length plaintext - 
 * Key	  : 0123 4567 89ab cdef 
 * Plain  : 0123 4567 89ab cde7 
 * Cipher : c957 4425 6a5e d31d 
 * 
 * Double-length key, single-length plaintext - 
 * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 
 * Plain  : 0123 4567 89ab cde7 
 * Cipher : 7f1d 0a77 826b 8aff 
 * 
 * Double-length key, double-length plaintext - 
 * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff 
 * Cipher : 27a0 8440 406a df60 278f 47cf 42d6 15d7 
 * 
 * Triple-length key, single-length plaintext - 
 * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567 
 * Plain  : 0123 4567 89ab cde7 
 * Cipher : de0b 7c06 ae5e 0ed5 
 * 
 * Triple-length key, double-length plaintext - 
 * Key	  : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567 
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff 
 * Cipher : ad0d 1b30 ac17 cf07 0ed1 1c63 81e4 4de5 
 * 
 * d3des V5.0a rwo 9208.07 18:44 Graven Imagery 
 **********************************************************************/

////////////////////////////////////////////////////////////////////////////////
//minrel
////////////////////////////////////////////////////////////////////////////////

void mrEncrypt(char *buf, int size) {
    int i, j, k;
    char c;
    unsigned char src[8] = {
        0xcc, 0x91, 0x46, 0xa3, 0x0b, 0x67, 0x19, 0x64
    };

    k = (int) (size / 2);
    j = 0;
    for (i = 0; i < k; i += 2) {
        c = buf[i];
        buf[i] = buf[k + i];
        buf[k + i] = c;
        buf[i] ^= buf[i + 1];
        buf[k + i] ^= buf[k + i + 1];
    }

    j = 0;
    for (i = 0; i < size - 1; i += 2) {
        buf[i] ^= src[j];
        j = (j == 7) ? 0 : j + 1;
    }
}

void mrDecrypt(char *content, int size) {
    char c;
    int i, j, k;
    unsigned char key[8] = {
        0xcc, 0x91, 0x46, 0xa3, 0x0b, 0x67, 0x19, 0x64
    };

    k = (int) (size / 2);
    j = 0;
    for (i = 0; i < size - 1; i += 2) {
        content[i] = content[i] ^ key[j];
        j = (j == 7) ? 0 : (j + 1);
    }
    for (i = 0; i < k; i += 2) {
        content[i] = content[i] ^ content[i + 1];
        content[k + i] = content[k + i] ^ content[k + i + 1];
        c = content[i];
        content[i] = content[k + i];
        content[k + i] = c;
    }
}

////////////////////////////////////////////////////////////////////////////////

